I have a cell-phone and I do not answer unknown numbers. Someone called today at 3:21 PM and did not leave a message. My phone number is registered on the national Do Not Call List and I reported this call to them. Based on this website I don't think I want to talk to them. This number has been added to my reject list.
I returned the call and it took about 15 seconds to have the lady remove me from their call list. Still, I agree that it is shabby marketing - a la the ever-invasive "Canadian Pharmacy." I expect much more from Hilton and find this disappointing.